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Question
Assertion (A): In a Dobereiner’s triad, the three elements present have the same difference of atomic masses.
Reason (R): Elements in a triad have similar properties.
Options
Both A and R are true and R is the correct explanation of A.
Both A and R are true but R is not the correct explanation of A.
A is true but R is false.
A is false but R is true.
MCQ
Assertion and Reasoning
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Solution
A is false but R is true.
Explanation:
Elements in a Döbereiner triad have similar properties, so R is true. The atomic mass of the middle element is approximately the arithmetic mean of the other two; the three masses do not have to have the same difference, so A is false.
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